Updated the post with Maximus VIII Series motherboards overclocking Guide:

Maximus VIII Series - Z170

1.OC guide for Maximus VIII series: BIOS, tools, Dram, CPU and LN2 OC in English by TL
2. Guide For Skylake motherboards - Memory testing on Maximus VIII Impact and Gene in English by Alex@ro
3. Power Consumption guide on skylake motherboards in English by der8auer
4. Video - Overclocking guide i5-6600K and i7-6700K in English by der8auer
5. Overclocking guide for i7-6700K in English by Chino